The Avengers are Earth's mightiest heroes and foremost super-team... "There came a day, a day unlike any other, when Earth's mightiest heroes found themselves united against a common threat. On that day, the Avengers were born - to fight the foes no single super hero could withstand! Heed the call, then - for now, the Avengers Assemble!"

First off, I think Wasp will make her official first appearance in Iron Man 3. Then, she and Ant-Man (whether it's Pym or Lang, I don't know) will be introduced in Avengers 2, so the transition to Ant-Man will be a smooth one for both the progression of the MCU, and the general audience who doesn't know anything about the characters.

As far as how much they'll be involved in Avengers 2, if they do make their appearance there, I think it'll be brief enough to make room for the main Avengers, but just cool enough for the people to look forward to their standalone film (assuming Wasp will be involved).

First off, I think Wasp will make her official first appearance in Iron Man 3. Then, she and Ant-Man (whether it's Pym or Lang, I don't know) will be introduced in Avengers 2, so the transition to Ant-Man will be a smooth one for both the progression of the MCU, and the general audience who doesn't know anything about the characters.

As far as how much they'll be involved in Avengers 2, if they do make their appearance there, I think it'll be brief enough to make room for the main Avengers, but just cool enough for the people to look forward to their standalone film (assuming Wasp will be involved).

From what I've heard, the Ant-Man film will be set in the past with Hank Pym, and in the present with Scott Lang, so it seems that if there's to be an Ant-Man joining The Avengers, it'll be Scott Lang.

@V_Scarlotte_Rose: I've heard the same thing, but the script has also undergone a vast amount of changes. Like, if Pym was a superhero in the past, where was he when the Chitauri invaded, ya know? If he wasn't Ant-Man at the time, why wasn't he working on the Cosmic Cube with SHIELD? Personally, I think it'll be Pym that's introduced first in Avengers, and then he'll get the suit stolen from him by Lang in the Ant-Man movie. Just a hunch though.

@V_Scarlotte_Rose: Well they have been doing pretty well so far, as far as following the books (Iron Man's origin, Loki being the first Avengers villain, etc.), so I have faith that they'll both be involved in one way or another. Edgar Wright seems to be pretty passionate about Ant-Man in general, so I'm not sure that he'd stray too far from the source material. We'll see about that soon enough, though.

As far as Ultron is concerned, I wrote an article on my website about how I think he'll turn up in the MCU later on. Feel free to read it!